support env vars in group definitions
support env vars in group definitions

bjaglin/crane,jesper/crane,tmc/crane,ghbliu/crane,t-suwa/crane,rmoorman/crane,bjaglin/crane,jesper/crane,dreamcat4/crane,dreamcat4/crane,rmoorman/crane,stajkowski/crane,inthroxify/crane,stajkowski/crane,tmc/crane,t-suwa/crane,michaelsauter/crane,michaelsauter/crane,inthroxify/crane,ghbliu/crane